[DeTomaso] ZF gear ratio

[Art Stephens]

     My old blue car had the 4.22 ring and pinion with the tall .642 fifth 
gear.  I was running 285/40-18 tires on the rear,  they were 27 inches in 
diameter.  In top gear,  the car did 3 mph for every hundred rpm,  or 30 mph 
for every thousand rpm.  Theoretically that would be 180 mph at 6000 rpm.  I 
can only verify these numbers up to 80 mph as I believe that is the highest 
speed limit in the land?  I would guess that keeping the car shiny side up 
would be the biggest problem at higher speeds without aero modifications.



----- Original Message ----- 
From: "boyd casey" <boyd411 at gmail.com>
To: <MikeLDrew at aol.com>
Cc: <detomaso at realbig.com>
Sent: Thursday, August 20, 2009 8:47 PM
Subject: Re: [DeTomaso] ZF gear ratio


> So If you built a higher horsepower engine would you need to change the
> gearing to get up to the 185 mph range  or just build an engine that along
> with more HP had a higher rpm range?
>
> Boyd
>
> On Thu, Aug 20, 2009 at 11:41 PM, boyd casey <boyd411 at gmail.com> wrote:
>
>> THANKS GUYS!
>> Boyd
>>
>>   On Thu, Aug 20, 2009 at 11:29 PM, <MikeLDrew at aol.com> wrote:
>>
>>>
>>> In a message dated 8/20/09 20 02 28, boyd411 at gmail.com writes:
>>>
>>>
>>> What is the standard gear ratio of the  ZF transaxle that came stock in 
>>> a
>>> 73
>>> Pantera (as far as the equivalent of a differential) and is 5 th gear
>>> considered an "over drive"
>>>
>>>
>>> The rear end ratio is 4.22, and both 4th and 5th gears are overdrive.
>>>
>>> If you look at your gearbox, you'll see the ratios for each gear (and
>>> reverse) printed on the ID plate which is riveted to the shifter cover
>>> (where the shift linkage enters the box).
>>>
>>> Mike
>>
>>
>>
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